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US 6,601,854 B2Granted
Shaft seal
AssigneeDresser-Rand Company
InventorPhilippe Jacques Auber
Life of this patent
Estimating the term…
Abstract
A shaft seal in which a rotary dealing part is mounted coaxially with a sealing element and forms therewith a primary seal between opposed faces of the sealing element and the rotary sealing part to substantially prevent fluid flow across the primary seal from a high pressure radial side to a low-pressure radial side. Secondary and tertiary seals are also provided between the high-pressure and low-pressure radial sides; and between an auxiliary sleeve and the seal housing, respectively.
Claims25
A shaft seal comprising a sealing element;
- a rotary sealing part mounted coaxially with the sealing element and forming therewith a contactless primary seal between opposed faces of the sealing element and rotary sealing part to substantially prevent fluid flow across the primary seal from a high pressure radial side to a low-pressure radial side;
- a seal housing;
- a pusher sleeve disposed between the seal housing and the sealing element, coaxially with and in contact with the sealing element and comprising an inner pusher sleeve element and an outer annular pusher disc, said pusher sleeve element and said pusher disc having respective radial surfaces maintained in contact with one another;
- biasing means urging the pusher disc away from the seal housing and against the sealing element to urge the sealing element axially towards the rotary sealing part;
- and a first sealing member disposed about the pusher sleeve element and located in a channel in communication with the high-pressure radial side to provide a secondary seal between the high-pressure and low-pressure radial sides;
- and an auxiliary sleeve disposed around the pusher sleeve element coaxially therewith and maintained in sealing contact with the pusher sleeve element by the first sealing member, the auxiliary sleeve being arranged to be urged in an axial direction by fluid pressure acting at the high-pressure radial side to form a tertiary seal between the auxiliary sleeve and seal housing.
3 more elements
A shaft seal comprising a sealing element;
- a rotary sealing part mounted coaxially with the sealing element and forming therewith a contactless primary seal between opposed faces of the sealing element and rotary sealing part to substantially prevent fluid flow across the primary seal from a high pressure radial side to a low-pressure radial side;
- a seal housing;
- a pusher sleeve disposed between the seal housing and the sealing element, coaxially with and in contact with the sealing element;
- biasing means urging the pusher sleeve away from the seal housing and against the sealing element to urge the sealing element axially towards the rotary sealing part;
- a first sealing member disposed about the pusher sleeve and located in a channel in communication with the high-pressure radial side to provide a secondary seal for the pusher sleeve between the high-pressure and low-pressure radial sides;
- and an auxiliary sleeve disposed around the pusher sleeve coaxially therewith and maintained in sealing contact with the pusher sleeve by the first sealing member, the auxiliary sleeve comprising an inner auxiliary sleeve element and an outer annular auxiliary disc, said inner auxiliary sleeve element and said outer annular auxiliary disc having respective radial surfaces maintained in contact with one another, the auxiliary sleeve being arranged to be urged in an axial direction by fluid pressure acting at the high-pressure radial side to form a tertiary seal between the auxiliary sleeve and seal housing.
3 more elements
Dependencies are inferred from the claim text.